What is Drink Your Milk?
1.
when some one takes a rip from a bong, and there is still milk-looking smoke in the bong.
"Bro, you didn't finish your hit- drink your milk son"
See
2.
A chant started when someone is forced to drink something extremely quickly
Frat Boy 1 - "I can't chug any more beer dude, seriously"
Frat Boy 2 - "Shut up you pussy. Drink your milk, drink your milk, DRINK YOUR MILK!!!"
See